Lathe



w. E. GROENE ND w. G. HOELSCHER.

. LATHE.

APPLICATION FILED OCT. 3. I911. 1,314,744.

Patented Sept. 2,1919.

4 SHEETS-SHEET1 org W. F. GROENE AND W. G. HOELSGHER.

LATHE.

APPLICATION FILED OCT. 3- I911- Patented Sept. 2, 1919.

4 SHEETSSHEET 2.

W. F. GROENE AND W. G. HOELSCHER. mug.

APPLICATION men on. s. 19H. 1,314,744. Patented Sept. 2, 1919.

4 SHEETS-SHEET a.

W. F. GROENE AND W. G. HOELSCHER.

LATHE. APPLICATION FILED OCT. 3. NH.

1,314,744. Patented Sept. 2, 1919.

' 4 SHEETS-SHEET 4- F23 7 1 4 's,

of Hamilton, and State of Ohio,

UNITED STATES PATENT OFFICE.

WILLIAM F. enomm AND WILLIAM G. HoELscI-IEa,

0F CINCINNATI, OHIO, ASSIGNORS TO THE R; K. LE BLOND MACHINE TOOL COMPANY, OF CINCINNATI, OHIO, A COR- PORATION or OHIO.

LATHE.

Application filed October 3, 1917. Serial m. 194,478.

To all whom it may concern:

Beit known that we, WILLIAM F. GROENE and WILLIAM G.. HOELSCHER, citizens of the United States, residing at Cincinnati, county have invented an Improvement in Lathes, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings repre' senting like parts.

The invention hereinafter described relates to machine tools and more particularly to lathes.

The usual lathe comprises a bed with live and dead spindles thereon to support and rotate the work, and a carriage supporting a cross slide'with a rest thereon for the tool acting on the work. .The carriage ma be fed to carry the tool longitudinally of the bed and the cross'slide may be fed to carry the tool transversely of the bed.

In certain classes of work it is also desirable to swivel the tool rest on the cross slide and feed the tool relatively to the work in different positions of angular adjustment. Mechanisms have been devised for this purpose, but they are objectionable for various reasons. Among others, they are tob large and cumbersome to apply to the smaller types of lathes where the distance between the top of the carriage and the center line of the spindle is limited. I

One of the objects of the present invention is to provide a strong, simple and compact mechanismfor feeding the tool relatively to the work in different positions of angular adjustment, suitable for small as well as large lathes.

In the practical embodiment of this fea-- ture of the invention,the shaft for driving the angular feed passes through the cross feed screw to the rear thereof and ermits its movement through a train of mec ianisni' I to apinion and rack for moving the top slide in the angular direction predetermined by adjustment of the angularly movable or swivelelement. 1

Il e;mnother object and important featureof the present invention consists in simple and effective means for quickly and accurately setting the tool rest to different positions of angular adjustment. invention, in the fornnlierein described, is carried into effect by one or more adjustable elements or dogs having means for securing it or them in. position for cooperative relation with a stop, the dogs and stop being associated, one with the slide and the other with the angularlyadjlistable tool carrying element or swivel member so that by adjustment of the dog or dogs the angular position of the swivel element is readily determined.

And still another object is to provide means for quickly locking the tool rcst'in its positions of adjustment. In carrying this feature of the invention into effect, the present invention, in the form herein described, contemplates a clamping device comprising .in its construction a split ring drawn to- This feature of the- Patented Sept. 2,1919.

or embodiment of the invention illustrated by the accompanying drawings and then tl1e novel features and combinations comprised within the invention will be definitely set forth by the claims.

Figure 1 is a front elevation of a portion of the lathe equipped with a mechanism embodying the invention;

Fig. 2 is a vertical transverse sectlon through the mechanism;

Fig. 3 is a perspective view of the pinion and rack device for feeding the upper slide at various angles, parts being broken away and others in section;

F ig. 4 is a vertical section taken on line Fig. 5 is a horizontal section showing the train ofmechanism in the apron for transmitting the drive to the cross slide and upper slide; l

Fig. 6 i a vertical section throughthe gear mechanism in the apron taken on line 6- 6 of Fig. 5;

Fig. '7 is a section Fig. 2 showing the upper slide and the lockin device for/the tool rest;

ig. 8 is a horizontal section taken on line 8'8 of Fig 2;

Fig. 9is a horizontalsection taken on line 9-9 of Fig. 2;

Fig. 10 is an elevation of adjacent curved portions of the swivel member and cross slide showing the scale on the former and theindex line on the latter adapted to be read in connection with said scale; and

Fig. 11 is a diagramillustrating the adjustments of the swivel member for turning faces on a gear blank.

Referring to the drawings, the machine I shown therein as embodying the invention comprises the usual standard supporting a bed, 3 having a live spindle head 4 and I dead spindle head 5 mounted thereon and 1 carrylng'spmdles 7 and 8- respectively for supportlng and rotating the work in the usual manner. v

A carriage 9 is'mounted on and adapted to be fed along tracks 11 on the bed longitudinally of the latter.

-A cross slide 13 is mounted on the carriage and is adapted to be fed-alongthe same transversely of the bed. It. is guided in this instance of the invention by a dovetail 14 on the carriage entering a groove in the bottom of the slide.

To feed the cross slide transversely of the bed, it may have a nut 15 (Fig. 2) se cured thereto and depending therefrom threaded toreceive a hollow screw shaft 17 extending transversely of said carriage and journaled in bearings therein, the construction being such that upon rotation. of the screw shaft'17 the cross slide 13 will be appropriately moved.

A gear, 19 fast on the feed screw shaft adjacent the forward endthereof is adapt ed to be driven by a-wide faced shiftablev gear 21 fast on a shaft rotatable and slidable in bearings 23 and 2-5 in the carriage. The front end of this shaft may-have a hand wheel26 (Fig. 5 fast thereon permitting rotation of" the wide faced gear and the. screw shaft to feed the cross slide manually. if desired. e

The wide faced gear my be adjusted a;

three different positions. When thrust to its; 'ezrtreme inward position, it' will be in mesh, Wlt-h the screw shaftgear and serve to trans mit rotation thereto. 'When pulled to its extreme outward position, it will. mesh with a; gear 27 on a shaft 28 projecting through the screw shaft for a purpose to be described. When in its intermediate position it will be out of engagement withboth' of. said gears.

The wide faced gear shaft may-be held in taken on line 7-7 of by a handle its two extreme positions of adjustment by a spring-pressed ball 29, adapted to enter circumferential grooves31 in said shaft.

Thus, the hand wheel serves the dual function of shifting the wide faced gear axially i to its different positions of adjustment and of rotating said shaft to manually feedthe' cross slide. The liubof the hand wheel may along a boss 35 projecting forwardly from the carriage to prevent the chips or cuttings from the tool from reaching and injuring the shaft or its bearing.

hme a sleeve 38 fastthereon which will slide The wide faced gear continually mesheswith a gear 37 loose on the shaft 28, referred to, adapted to be driven by a gear 39 (Figs.

2, 5 and 6) fast on a studshaft journaled I and adapted to slide in bearings in the carriage apron 43. The gear is driven by a wide faced nectedby a friction clutch 49 with a large pinion 45, adapted to be con-.

bevel gear 51, said clutchbeing cont-rolled by ahandle 53 (Fig. 1) on astem 54 passing through the'pinion '45 and connected to the hub of the bevel gear 51. The latter may be rotated in oppositedirection's by bevel pinions 55 and 57 (Fig. '6) fast on a sleeve 59 splined-to a driving shaft 61. The sleeve may be shifted axially of said shaft to bring said bevel pinions alternatively into mesh with saidbevel ear by a yoke 63 controlled apron.

The slide may be fed in opposite directions from, the shaft 61 by a driving train in the apron quite similar tothat cut, No. 980,971, ofR-a K. Le Blond and W. F. Groene, granted January 10, 1911.

To, feed thecarriage longitudinally of the 5 y 10 i Fi 2) fast thereon ear 39, "referred to,

a gear 69 on a shaft 71 gear 39 and inion 67 may be shiftedaxially' When this by ahandle '6 (Figs, 1 and 2). handle is thrust inward, the gear 39 will be thrown out of mesh fwiththe gear 1 37,- thereby interrupting the transmission tothe cross slide, and the pinion 67 will be thrown into mesh with the rack gear 69, thereby completing the transmission to the pinion,

.73. and causing the carriage to feed longi tudinally' of the bed.

To feedthe .ca'rriage manually along'the.

bed, the gear 69 (Fig-5) may mesh with a bearing in the apron and carrying a hand wheel 83 at the'front of the apron. y A swivel memberSfi-(F'gs. l and 2) is" mounted on a portion of the. slide and said parts have vertical registering bore'srecei'v- (Fig. 1) at the front of the 4 construction is such that the cross in bearings in the apron pinion 79 fast on a shaft81 journaled in 'a' i shown in Letters Pating a bushing 87 about which said swivel 1 105 (FigsQl and 9 the swivel'member in the member is adapted to turn.

To secure the swivel member in different "positions of angular adjustment on said cross slide, said member and slide may have opposed conical projections 91 occupying a recess 93 in the base of. said swivel member.

Clamping means,-in the present instance of the invention, comprises a split ring having sections 95 (Fig. 8) adapted to embrace said conicalprojections.

Horizontal screws 97 maybe threaded into one section and pass loosely throu h the other section, and thence outwardly t rough hearings in the swivel member. One of said screws presents a squared end 99 adapted to receive a handle or wrench for adjusting the same. The other screw has a head adapted to receive a' screw driver to set the same in proper position of adjustment when theparts are assembled. The screws have washers 103 confined between shoulders on said screws and one of the ring sections. The construction is such that one of the screws may be adjusted to a fixed position and the other maybe tightened to contract the split ring and cause thesame to grip the conlcal projections of the slide and swivel member and .securely hold the latter in its positions of rotative adjustment on the former.

Next will be described means to facilitate prompt and accurate angular adjustment of the swivel member with respect to thecross slide. This means, in the present instance of the invention, com rises one or more dogs j having curved tongues 107 fitting a circumferential groove 109 in the cross slide. Each dog may have an elongated slot 111 therein receiving a pair of screws 113 adapted to be secured in a series of tapped "holes 115 (-Fig. 9) in said groove. The elongated slots may be longer than the holes, and hence it is qulred position of ment in said groove. and 2) may be secured circumferential -adjust A stop 117 (Figs. 1 to the under side of path of said dogs and cooperate therewith to determine the angular adjustment of the swivel member according to the location of the dogs.

To enable the dogs to be quickly-and accurately set in their positions of adjustment, scales 119 and 119 (Figs. 10 and 11) may be provided comprising series of gradpations on a circular portion of the swivel member,-

each series being marked from 0 to 90, and adapted to be read in connection with dian'ietrically'opposed index lines 120 (Figs. 9 and 10) on the curved portion of the cross slide directly beneath the swivel member.

.In setting the parts in position "to turn faces at di erent angles w1th respect to a p ece of work, the swivel member is rotated until the graduation on one of thescales corresponding to the angle desired, registers with one of the index lines on the cross slide. Then one of the dogs is adjusted in the circumferential groove in the cross slide to turn another face having a different angle on-the work, the swivel memberflis rotated until the graduation on the other scale cor-' responding to the angle desired, registers with the other index line. In the course of this adjustment, the stop on the swivel member will assume a different position. Then the other stop dog is adjusted in the circumferential groove of the cross slide until one of the ends thereof engages said stop. The dog will then be in position to determine the adjustment of the swivel member the next time it is desired to turn a face on the work at the same angle without the necesslty for reference to the scale.

For example, it may be supposed that it is desired to turn on a gear blank a (Fig.

11) a face at an angle of 30to the plane of the gear in readiness to have teeth milled therein, and that it is desired to then turn 'a back face on the blank at an angle of 45 to the plane of the gear. If the turning tool L on the tool rest is erpendicular to the axis of the gear when t e zero raduations of the scales register with the in ex line 120,

.t'hen the swivel member will be rotated to its groove to a position determined by its.

engagement with member.

To set the swivel member in position to turn the back face of 45 on the gear blank, the screw 97 is adjusted to release the ring sections from the swivel member, thereby permitting the latter to be rotated until the the stop 117 on the swivel graduation of the scale 119' thereon marked a 45? registers with the other index line. The

screw 97 is then adjusted to tighten the ring. sections to the swivel member to secure the The screw 97 is then upper slide and another tool '0 Simultaneous rotaand feeding of the willturn the face-on the gear bank at an angle of 45 to the plane thereof. To enable the return of the swivel member to this same adjustment without reference to the'scale, the other dog 105 is adjusted to a position determined ,by its enga ement with the stop 117 on the swivel mem er.

Thus, any desired angle may be turned on successive gear blanks by adjusting the swivel member to a position determined by the engagement of its stop with one of the dogs, and then byadjustin'g said swivel member same in this position. tion of the gear blank to a position determined by the engagement of its stopwith he other dog. The construction is such, that the swivel member can bequickly and accurately adjusted with'- out reference to the scale.

An upper slide121 may be mounted on the swivel member and have guiding connection therewith, as by a dovetail 123 projecting downwardtherefrom into a groove on the top of the swivel member.

To feed the upper slide along said memher, the slide may have a toothed element,

in the present instance of the invention, in

the form of a rack 125 (Figs. 1, 2 and 3).

secured by screws 129 to the under face 0 the dovetail on the slide.- This rack projects into a recess in the top'of the swivel member and meshes'with a pinion 131 in said I recess mounted fast on the upper end of a vertical shaft 133 keyed to a sleeve 135' journaled in the swivel bushing '87, referred to.

The lower end of said sleeve has a bevel gear 137 fast thereon driven by a bevel pinion 139 havinga hub fast on one ing 143 in the, cross slide, and confined movement in said bearing.

is splined to the hub of a gear 145'journaled in a bearing in a bracket 147 secured'to the rear end of the carriage.

The construction is such, that when the cross slide is fed trans- "shaft 28,

"the hollow screw shaft 17 for feeding said shaft will slide of said gear, butwill al-, to transmit the feed to the versely of thecarriage, through the .hub ways be effective upper slide in the var ous positions of the The ing a b journaled in a bearing1 in said bracket and secured to the upper s ide feed referred to, which prqjects through cross slide.

cross -slide.,. a. 't

When the wide ,faced gear21 is shifted outwardly by the handwheel 26, it will 'orin said gear into mesh with the ear 27 on t e .forwardend of the up er sli e feed shaft-.28. As a result wheat o hand wheel apron 1s faces at angles of 30 and 45 or under the control of the hand e end of ashaft 141 and ournaled in a bushing in'a'bearear 145 is driven b'ya gear 149, hayto be fed manually throughthe train oi gearing described. If the gear 39 in the the gear 37, the wide faced gear will be driven fromthe gear train described inthe apron, thereby permitting-the upper slide to be fedby power.

cross slide .or the'upper slide maybe fed accordin to vwhether the wide faced gear is shifte to mesh with the driving gear on the cross feed screw Shaftor'; the driving gear on the upper slide feed shaft-projecting through said screw shaft. 7

The direction of feed for both 'of said slides will'be determined by adjustment of shifted outwardly mtomesh with the construction described, either the i the bevel pinions' 55 and 57, referred to, into I or out of mesh with the bevel ear 51and front of the apron. I

To confine the feed screw shaft for the cross slide against axial movement, it may have a collar 151 (Fig. 2) faston the rear end thereof confined between an end of a 1 recess in the bracket 147 and a sleeve nut .153 threaded in said recess andsecured by a set screw 155. This nut may be adjusted to take up. wear onsaid collar and prevent lost motion of the screw shaft in the direction of its axis.

suitable mstrumentahty, but, in the pres; ent instance of the1nvent1on,.=it serves to support a tool rest or turret157 (Figs. 1

'65 at the I The up er slide may serve to support any To "secure the 10 have its'inner end adapted to engage notches 162 in the turret correspondin to the num-z ber of tools carried thereby. 's, plunger is normally urged inward to its active looking position by acoil spring 163 in a bore nected "by a pin v173 with a handle 175 fulcrumed on an ear 17.7 projecting from the upper s11de.-

" I It will be noted that the rack and pinion for feeding the upper slide along the swivel enga'gea lug 171 the locking plunger. To nlock the latter, its outer end niay be con- 3 iii said upper slide and confined between a H member; are mounted in the same horizontal plane, and that the swivel member may be adjusted about the axis of said pinion'to any position ,of' rotative adjustment withi out interference with the feeding of the slid along the swivel member. The rack and pinion and the gear train for rotating the latter, constitute a strong, compact organization, enabling the upper slide to be mounted closely adjacent to the upper surface of the carriage. Thus the mechanism is well adapted not only to large lathes, but also to small lathes, which necessarily have a limited space between the upper surface of the carriage and the spindle centers, in which to accommodatethe feeding mechanism for the upper slide.

The machine described provides a simple and effective mechanism enablingthe carriage to be fed longitudinally of the bed; the crossslide to be fed transversely of the bed and the upper slide to be fed in any selected direction in a horizontal plane; and the carriage and both slides may be fed by power or manually as desired with a minimum number of adjustments.

It will be understood that the invention is not limited to the specific embodiment shown, but that various deviations may be made therefrom without departing from the spirit and scope of the appended claims.

What is claimed is 1. The combination of a carriage, a crossslide thereon, a hollow feed screw operatively. connected to the cross slide, an upper slide on the cross-slide, a feed shaft for the upper slide extending-through the hollow feed screw, a driven shaft carried by the crossslide, driving connections between the feed shaft and driven shaft, and a train of mechanism including a rack and pinion for transmitting power from the driven shaft to the upper slide.

2. The combination with a carriage, of a cross-slide thereon, a hollow fee'd screw journaled in the carriage for moving the cross-slide, a swiveled member on the crossslide, an upper slide on the swiveled member, a feed shaft for the upper slide extending through the hollow feed screw shaft, a shaft journaled on the cross-slide and operatively connected with the upper slide, and driving connections between the feed shaft and shaft on the cross-slide.

3. In a machine tool, the combination of a carriage, a lower cross-slide mounted thereon, a hollow feed screw for the slide, a

swiveled member mounted onthe'cross-slide for angular adjustment, an upper slide mounted on the swiveled member, clamping means between the swiveled member and lower cross slide for clamping them in angularly adjusted relation, a feed shaft extending through the feed screw, a train of gearing extending through the awer cross slide and swiveled member and connected to the feed shaft, and means for driving the feed shaft. Y

4. The combination with a carriage, of a cross slide thereon, a nut on said slide, a hollow feed screw for said nut, an upper slide mounted on said cross slide, and means to feed said upper slide relatively to said cross slide including a shaft in said hollow feed screw.

5. The combination with a cross slide thereon, feed screw for said nut, an upper slide mounted on said cross slide, a feed shaft for said upper slide, means at the front of said carriage for driving said shafts, a driven shaft, gears at the rear of said carriage to transmit power from the feed shaft for said upper slide to said driven shaft, and gears to transmit power from said driven shaft to said upper slide.

carriage, of a 6. The combination with a carriage. of a 7. The combination with a carriage, of a' cross slide thereon, a nut on said slide, a feed screw for said nut journaled in said carriage, a member swiveled on said cross slide, an upper slide on said member, a feed shaft for said upper slide, and means to transmit power from the shaft for said up per slide to the latter including a shaft beneath said swiveled member journaled on and movable axially with said cross slide.

8. The combination with a carriage, of a cross slide thereon, a feed screw shaft for said slide, an upper slide, swiveled on said cross slide, a feed shaft for said upper slide journaled in said carriage, and means to transmit power from said feed shaft to said upper slide including a driven shaft journaled on said cross slide, and gears to transmit power from said feed shaft to said driven shaft, the latter being movable axially of one of said gears.

9. The combination with a carriage, of a cross slide thereon, a feed screw shaft for said slide, an upper tively to said cross slide including a feed shaft journaled in said carriage, on said cross slide, a bearing on riage, a driven shaft journaled in said carsald bearings, and gear means to transmit power from a bearing slide swiveled on said .cI'OSs slide, and means to feed the latter relasaid driven shaft, a rack gear on said swivel slide, mg gears gears driven shaft in said bearings,,gears'to rotate said driven shaft from said feed shaft, a swivel shaft, gears to rotate the latter from shaft, and a rack on' said upper slide meshing with said rack gear.

' 11. The COIIIb IlatIOII WItlI a carriage, of a cross slide thereon, a nut on said slide, a holin said carriage, an upper slide swiveled on said cross slide, a feed shaft for said upper slide projecting through said hollow shaft, gears on said shafts, and a shiftable gear for driving either of said gears.

12. The combination with a carriage, of-a cross slide thereon, a feed shaftfori said slide, an upper slide swiveled on said cross slide,-a feed shaft for said upper slide, gear means to transmit power from thefeed shaft for said upper slide to the latter, driving on said shafts, and a shiftable gear adapted to mesh with either of said driving gears. v Y

13. The combination with a carriage, of a cross slide thereon, a feed shaft for said slide, an upper slide swiveled on said cross slide, a feed shaft for said upper slide, gear means to transmit power from said last named feed shaft to said upper slide, driving gears on said shafts, a shiftable gear, and manually operable means for rotating the latter and shifting. the same into and out of mesh with said driving gears.

14. The combination with a carriage, of across slide thereon, a feed shaft for said slide, an upper slide swiveled on said cross a feed shaft for said upper slide, drive on said feed shafts, a shiftable gear adjustable to mesh with either of said driving gears, a gear loose on the feed shaft for said upper slide meshing with saidshiftable gear, and means todrive said loose gear.

15. The combination witha carriage, of a cross slide thereon, aswivel member on said,

cross slide, means connecting said slide and 'swivel member including opposed conical elements, means embracing said elements, means to adjust said embracing means to tend to draw said elements toward one another, an upper slide on said swivel member, drivln means on said carriage, and'means extending throu h the swivel member to transmit power rom said driving means to said upper slide to feed the latter on said swiveled member.

16. The combinationwith a support, of a slide thereon, swivel means connecting the same, said support having a circumferential groove with a series of tapped holes therein,

adog .in said groove, a screw to enter said holes selectively, to secure said dog in different positlons of adjustment on said support, and a stop on said swivel means colow feed screw shaft for said nut journaled ment of said swivel member.

- gage said dog operating with. said dog to position said swivel means,

' 17. The combination with a support, of a slide thereon adjustable angularly relatively to said support, a dog for one adjustable to different fixed positions, a stop on the other for engagement-with said dog, and a scale and index means for indicating the adjustment of said slide.

.18. The combination with a support, of a slide thereon adjustable angularly relatively to said support, a dog on said support, means to secure said dog in difierent positions of adjustment 'circumferentially of saidsup port, a stop on the slide to engage said dog, and means to indicate the angular adjustment of said slide. Y

19. The combination with a slide of a, swivel member thereon, a dog on said slide, means to secure said dog to said slide in dif-' ferent positions of adjustment, and a stop on said swivel member for engagement with said dog to determine the angular adjust- 20. The combination with, avsupport having a series of spaced tapped holes therein, v I

of a swivel member on saidsupport, a dog having an elongated slot therein of greater lengtlr'tllan thespaces between said holes,

a screw in said dog adapted to enter anyof' said holes, and a stop on said swivel member to engage said dog and determine the angue lar adjustment of said swivel member.

21. The combination with asupport hav.

ing a circumferential groove therein, of a swivel memberon saidsupport, a dog having a tongue entering said groove, meansto secure said dog in different positions in said groove, astop on said swivel member toenand determine the angular adjustment of said swivel member, a'slide on the latter, and means to feed said slide alongsaid swivel member.

22. The combination'with a support, of a slide thereon adjustable angularly relatively to said support, a pluralitypf dogs adjustably secured to said support, and'a stop for said slide for engagement with said dogs to enable repeated angular adjustment of said I slide to positions determined by said dogs.

23. The combination with a support, of a swivel member thereon, dogs adjustable. cir- T cumferentially of said support to fixed positions, and a stop on said swivelfmember adapted to engage either of said dogs, said. swivel member and support-having scale and index means for indicating the angular adjustment of'said swivel member. 24,.The combination with asupport, of a swivel member thereon, a slide on said member, said support and swivel member having v graduated scale and lndex .meansfor indi- 2 eating the angular adjustment of said swivel member, a stopon the latter, a dog on said support adjustable to engage said stop and determine repeated angular, adjustment of said member to a selected position, and means to feed said slide in any of its positions of angular adjustment.

, 25. In a machine tool, the combination of a carriage, a cross-slide thereon, a feed screw extending from front to rear of the carriage for moving the cross slide, a swivel member mounted on the cross slide, an upper slide mounted on the swivel member, means for adjusting and clamping the swivel member in angular relation to the cross-slide, a feed shaft extending through the feed screw, .a driven shaft mounted on the cross slide, gearing at therear of the carriage for 0 er-' atively connecting the feed shaft, and driven shaft, and operatmg connections between the driven shaft and upper slide for moving the latter relative to the swivel member inits angularly adjusted position.

In testimony'whereof we have signedour names to this specification.

WILLIAM F. GROEN E. WILLIAM G. HOELSCHER; 

